Creating DS0 Bundles
To set the bandwidth for an FT1 subchannel, you can aggregate DS0 timeslots into bundles of different sizes. Any bundle of DS0s takes on the characteristics of a single fast T1 channel.
To create a DS0 bundle:
- In the Instance Explorer, select the module that you want to configure (CT1, CE1, or CT3), and then:
- For a CT1 or CE1 module, double-click the module.
A list of DS1 interfaces appears for the module.
- For a CT3 module, navigate down to the DS1 Interfaces level.
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NOTE: The CT1 and CE1 modules do not have line interfaces.
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- For a CT3 module, select the DS1 interface for which you want to create a DS0 bundle, select Create, right-click, and select DS0 Bundle.
The Create DS0 Bundle dialog box appears. The following example is for a CT3 module.
- Set the parameters (Table 41).
Table 41: DS0 Bundle Parameters
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Name
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Identifier for the interface; generated automatically
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Alias
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Description of the interface; 0-15 characters; default: blank
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IfIndex
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Identifier for the interface on the particular line interface; generated automatically
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Operational
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Current operational status of the interface
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Administrative
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Desired status of the interface: Up/Down; default: Up
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HDLC Settings
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Default template settings are automatically applied
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CRC Checking Enabled
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Cyclical redundancy check (CRC); an error-checking technique
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Data Inversion
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Provides ones density, a method for inserting 1s in the data stream. If you enable data inversion on your device, be sure it is also turned on at the other end of the line on the destination device.
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CRC Algorithm
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Cyclical redundancy check (CRC) can be set to 16 bits or 32 bits; default 16 bits
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MTU
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Maximum transmission unit; the largest size allowed for a data packet transmitted over a transmission line; range 4-32763; default 1024 bits
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MRU
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Maximum receive unit; the largest size allowed for a data packet received over a transmission line; range 4-32763; default 2048
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DS0 Bundle Time Slots
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Number of DS0 bundle timeslots; 24 per DS1 channel on a CT3 or CT1 module; 31 per DS1 channel on a CE1 module; use to configure a T1 subchannel
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DS0 Bundle Speed
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Speed that you select determines the allocated bandwidth for each timeslot; default 64 Kbps
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Allocated Bandwidth
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Result of the number of DS0 bundle timeslots selected (1-31) times the DS0 bundle speed selected (56/64 Kbps)
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Apply Template...
Save As Template...
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See Chapter 9, Using Templates.
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- To configure the DS0 Bundle Time Slots parameters, click each timeslot that you want to include in the DS0 bundle.
A check mark appears in each selected timeslot, and the slot changes to green.
To configure a bundle for the CT3 and CT1 modules, select any number of timeslots (1-24) in any sequence. For the CE1 module, select any number of timeslots (1-31) in any sequence. For example:
In this example, the timeslots selected are 4, 5, 6, and 7. These slots make up the DS0 bundle. The bundle defines the bandwidth for transmitting data for the FT1 subchannel. If you choose 64 Kbps as the speed for the DS0 bundle, the bundle provides the FT1 subchannel with 384 Kbps allocated bandwidth: 6 timeslots x 64 Kbps. Any timeslots marked with X are unavailable for the bundle that you are creating because they are in use by another bundle.
